Adjustable scrapable high-voltage cable pitch coating device

Abstract

The invention discloses an adjustable scrapable high-voltage cable pitch coating device which comprises a sprayer (5) for painting pitch, a scraping belt (11) for performing scraped finishing on the surface of the cable painted with pitch, a variable frequency motor (1), a frequency converter (2), a programmable logic controller (3) and a potentiometer (4), wherein the potentiometer (4) presets analog quantity for flow of the pitch, signals of the potentiometer (4) are transmitted to the PLC (3) and then transmitted to the frequency converter (2) through digital operation of the PLC (3), the frequency converter (2) is provided with low-speed vectors for controlling actions of the variable frequency motor (1), and flow of a pitch pump is controlled by rotating speed of the variable frequency motor (1), so that the sprayer (5) is controlled to spray pitch with proper flow. The adjustable scrapable high-voltage cable pitch coating device effectively controls the flow of the pitch by adopting an electric automatic closed loop, solves the problem of even coating of the pitch and achieves stable coating during production of high-voltage cables.

Description

technical field [0001] The invention relates to a high-voltage cable bitumen coating device, in particular to an adjustable and scrapable high-voltage cable bitumen coating device. Background technique [0002] In the production process of high-voltage power cables of 110 kV and above, the anti-corrosion coating process of the metal sheath is an important process. Generally, the asphalt anticorrosion layer is applied before the sheath unit enters the machine head for extrusion. At present, most domestic high-voltage cable manufacturers use heating cable asphalt, such as the oil heating asphalt coating device disclosed in CN201717061U. Similar to the above-mentioned oil heating asphalt coating device, no matter whether the heating wire or the heating oil is used, there has always been a problem that makes the entire high-voltage cable production enterprise a headache: [0003] 1. Bitumen flow is not easy to control: Bitumen flow control is the source of the entire coating de...

AI Technical Summary

Problems solved by technology

Similar to the above-mentioned oil heating asphalt coating device, no matter whether the heating wire or the heating oil is used, there has always been a problem that makes the entire high-voltage cable production enterprise a headache:

[0003] 1. Bitumen flow is not easy to control: Bitumen flow control is the source of the entire coating device. It is necessary to control the flow of the bitumen pump and ensure that the entire threaded cable is completely coated

At present, the main method is to smear the cable by changing the structure of the nozzle or using a pulley to drive the asphalt to a high place to form a waterfall. This will cause a large amount of asphalt to be applied to the surface of the cable and cause great resistance to scraping.

[0004] 2. Uneven application of anti-corrosion layer: Since the liquid formed by asphalt after heating is viscous, and the metal sheath of high-voltage cables is generally threaded, once a large amount of asphalt is sprayed into the threads on the metal surface of the cable, according to the temperature of the metal surface and the ambient temperature, the asphalt in the thread cannot be effectively and evenly applied

After the asphalt is sprayed on the surface of the cable, it needs to be scraped clean. At present, it mainly relies on the rag or silica gel plate at the rear end of the asphalt device for scraping. Since there is a certain distance between the cable surface and the scraper, the distance between asphalt spraying and scraping There is a certain time difference between them. A longer time difference will cause the cooling of the asphalt and the asphalt in the cable thread cannot be effectively scraped, so that the metal surface of the cable is unevenly coated or a large amount of asphalt stays in the thread, so it will be on the outside. In-line sheaths cause surface roughness and unevenness, which seriously cause cable outer sheaths to be re-produced

Images